Upper critical fields in Ba2Ti2Fe2As4O single crystals: Evidence for dominant Pauli paramagnetic effect

Abdel-Hafiez, M.; Brisbois, Jérémy; Zhu, Z.; Hassen, A.; Vasiliev, A. N.; Silhanek, Alejandro; Krellner, C.

doi:10.1103/PhysRevB.97.115152

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Upper critical fields in Ba2Ti2Fe2As4O single crystals: Evidence for dominant Pauli paramagnetic effect

Abdel-Hafiez, M.; Brisbois, Jérémy; Zhu, Z. et al.

2018 • In Physical Review. B, 97, p. 115152

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10.1103/PhysRevB.97.115152

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Keywords :

superconductivity

Abstract :

[en] We report on magneto-optical imaging and the temperature dependency of the upper critical fields Hcc2(T) parallel to the c axis and Habc2(T) parallel to the ab plane in Ba2Ti2Fe2As4O single crystals. These data were inferred from the measurements of the temperature-dependent resistance in static magnetic fields up to 14 T and magnetoresistance in pulsed fields up to 60 T. Hc2 values are found to be 52 and 50 T for H∥ab and H∥c, respectively. These values are 1.2–1.35 times larger than the weak-coupling Pauli paramagnetic limit (Hp∼1.84Tc), indicating that enhanced paramagnetic limiting is essential and this superconductor is unconventional. Our observations of strong bending in the Habc2(T) curves and a nearly isotropic maximum upper critical field Habc2(0)≈Hcc2(0) support the presence of a strong Pauli paramagnetic effect. We show that the Werthamer-Helfand-Hohenberg (WHH) formula that includes the spin-orbit scattering can effectively describe the Habc2(T) curve, whereas Hc2 deviates from the conventional WHH theoretical model without considering the spin paramagnetic effect for the H∥c and H∥ab directions. For H∥c, a two-band model is required to fully reproduce the behavior of Hc2, while for H∥ab the spin paramagnetic effect is responsible for the behavior of Hc2. The anisotropy of Hc2 is close to 3 near Tc and decreases rapidly at lower temperatures.

Disciplines :

Physics

Author, co-author :

Abdel-Hafiez, M.

Brisbois, Jérémy ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés

Zhu, Z.

Hassen, A.

Vasiliev, A. N.

Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés

Krellner, C.

Language :

English

Title :

Upper critical fields in Ba2Ti2Fe2As4O single crystals: Evidence for dominant Pauli paramagnetic effect

Publication date :

March 2018

Journal title :

Physical Review. B

ISSN :

2469-9950

eISSN :

2469-9969

Publisher :

American Physical Society

Volume :

Pages :

115152

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 16 March 2018

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